Arthur AI vs Lakera Guard
Agent-native side-by-side. Scores are curated estimates on a 0–10 scale. Lock-in: higher = worse. Prefer JTBD picks via /api/decide when choosing for a job.
| Dimension | Arthur AI | Lakera Guard |
|---|---|---|
| Overall | 7.9 | 8.2 |
| Capability fit | 8.2 | 8.8 |
| Price / performance | 8.0 | 7.8 |
| Latency / reliability | 8.0 | 8.4 |
| Developer & agent DX | 8.2 | 9.0 |
| Privacy / data retention | 7.8 | 8.8 |
| Lock-in risk (higher = worse) | 4.5 | 5.5 |
| Maturity / track record | 8.0 | 8.0 |
| Pricing | As of 2026-09-14 (arthur.ai/pricing): Free $0 — 4 use cases, 5k jobs / 300k spans / 12k inferences / 3k evals, 7-day retention. Premium $60/mo — 100 use cases, 20k jobs / 1.2M spans / 100k inferences / 75k evals, 30-day … | As of 2026-09-14 (platform.lakera.ai/pricing): Community $0 — 10k requests/mo, 8k-token prompt cap, SaaS EU residency, SOC2/GDPR. Enterprise sales-gated — flexible volume, configurable prompt size, SaaS or self-host, SSO… |
| Tagline | Monitoring/evals peer with a real $60 Premium. Prefer Braintrust/Langfuse for tracing defaults; Arthur when… | Depot pick for a dedicated prompt-injection firewall in front of any LLM. NeMo when you need programmable… |
Arthur AI
Monitoring/evals peer with a real $60 Premium. Prefer Braintrust/Langfuse for tracing defaults; Arthur when governance+Shield narrative matters. Strengths: Public Free/Premium monitoring+evals card; Agent-oriented spans/jobs metering; Shield firewall for enterprise.
Strengths
- Public Free/Premium monitoring+evals card
- Agent-oriented spans/jobs metering
- Shield firewall for enterprise
Weaknesses
- Shield price opaque
- Not a specialist injection API like Lakera
- Premium limits still thin vs Braintrust scale
Lakera Guard
Depot pick for a dedicated prompt-injection firewall in front of any LLM. NeMo when you need programmable rails; OpenAI Moderation for free taxonomy flags. Check Point acquisition is real — product still has a public API. Strengths: Purpose-built prompt-injection / jailbreak / leakage API with sub-50ms narrative; Real
Strengths
- Purpose-built prompt-injection / jailbreak / leakage API with sub-50ms narrative
- Real free Community tier for eval
- EU-native residency on the free plan
Weaknesses
- Paid SKU is sales-gated (no Pro list price)
- Post-Check Point packaging/quote path may slow indie procurement
- Not a full policy engine like NeMo Guardrails
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